I Rayleigh scattering VS Raman scattering

Ebi Rogha
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When studying incidental photons, when should I use elastic scattering (Rayleigh scattering) and when inelastic scattering (Raman Scattering)?
What is the application of each of them?
 
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Ebi Rogha said:
I do not understand when we use elastic approach and when use inelastic approach for:
1- an incident light
2-an incident single photon
Is this an idle question? Or, is there some specific reason for asking?
 
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
If we release an electron around a positively charged sphere, the initial state of electron is a linear combination of Hydrogen-like states. According to quantum mechanics, evolution of time would not change this initial state because the potential is time independent. However, classically we expect the electron to collide with the sphere. So, it seems that the quantum and classics predict different behaviours!

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